<template>
    <button @click="isShow = true">点我弹窗</button>
    <teleport to="body">
        <div v-if="isShow" class="mask">
            <div class="dialog">
                <h3>我是一个弹窗</h3>
                <h4>一些内容</h4>
                <h4>一些内容</h4>
                <h4>一些内容</h4>
                <button @click="isShow=false">关闭弹窗</button>
            </div>
        </div>
    </teleport>
</template>

<script>
    import {ref} from 'vue'
    export default {
        name:'Dialog',
        setup(){
            let isShow = ref(false)
            return {
                isShow
            }
        }
    }
</script>

<style>
    .mask {
        position: absolute;
        top: 0; bottom:0; left: 0; right: 0;
        background-color: rgba(0, 0, 0, 0.5);
    }

    .dialog {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%,-50%);
        text-align: center;
        width: 300px;
        height: 300px;
        background-color: green;
    }
</style>